Apple MC408LL Apple Technician Guide - Page 35

Jump to 'Optical Drive Noisy, Internal Speaker' symptom

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Deep Dive Check 1. Run latest available service diagnostics. Was an error reported? 2. Does the noise sound like fan running faster than expected? 3. Does the noise change when the optical drive is being accessed or media is inserted or ejected? 4. Mute the system volume. Connect a pair of headphones to audio out port. Verify whether the issue still occurs. 5. Remove fan and rotate the blades. Verify that fan blades spin smoothly without interference with fan housing. 6. Reinstall fan, carefully ensuring that its cable is routed properly and there's no interference with the fan blades. After reassembling system verify that the noise issue is resolved. Result Yes No Yes No Yes No Yes No Yes No Action Suspect possible fan or sensor error. Check fan cable connection to the logic board. Go to step 2. Reset SMC by disconnecting power cord for ~15 seconds then retest. If issue persists go to step 3. Go to step 5. Suspect issue with optical drive or media being used. Jump to 'Optical Drive Noisy' symptom flow. Go to step 4. Go to step 5. Suspect issue with speaker or audio circuitry. Jump to 'Distorted Sound From Internal Speaker' symptom flow. Go to step 6. Replace fan. Yes Proper reassembly resolved noise issue. Suspect issue was caused by interference from wiring, or possible fan housing distortion when installed in system. No Go to step 7. Code X23 2010-08-03 Mac mini (Mid 2010) Symptom Charts - Startup and Power 35

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Mac mini (Mid 2010) Symptom Charts — Startup and Power
35
2010-08-03
Deep Dive
Check
Result
Action
Code
1.
Run latest available service
diagnostics. Was an error
reported?
Yes
Suspect possible fan or
sensor error. Check fan cable
connection to the logic board.
No
Go to step 2.
2.
Does the noise sound like fan
running faster than expected?
Yes
Reset SMC by disconnecting
power cord for ~15 seconds
then retest. If issue persists go
to step 3.
No
Go to step 5.
3.
Does the noise change when
the optical drive is being
accessed or media is inserted
or ejected?
Yes
Suspect issue with optical
drive or media being used.
Jump to ‘Optical Drive Noisy’
symptom flow.
No
Go to step 4.
4.
Mute the system volume.
Connect a pair of headphones
to audio out port. Verify
whether the issue still occurs.
Yes
Go to step 5.
No
Suspect issue with speaker
or audio circuitry. Jump
to ‘Distorted Sound From
Internal Speaker’ symptom
flow.
5.
Remove fan and rotate the
blades. Verify that fan blades
spin smoothly without
interference with fan housing.
Yes
Go to step 6.
No
Replace fan.
X23
6.
Reinstall fan, carefully ensuring
that its cable is routed properly
and there’s no interference
with the fan blades. After
reassembling system verify that
the noise issue is resolved.
Yes
Proper reassembly resolved
noise issue. Suspect issue
was caused by interference
from wiring, or possible fan
housing distortion when
installed in system.
No
Go to step 7.